Method of controlling the vibration of diaphragms.



A. HAYES. g y METHOD OF GONTROLLINGTHE VIBRATI ON OF DIAPHRAGMS.

APPLICATION FILED JULY 10, 1913.

1,071,668. Patented Aug. 26, 1913.

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ALBERT HAYES, 0F SALT LAKE CITY, UTAH, ASSIGNOR TO VOCATONE NIFG. CO.INC., A CORPORATION OF NEW YORK.

METHOD OF CONTROLLING THE VIBRATION OF D1APHIAGM$.

Specification of Letters Patent.

Patented Aug. 26,1913.

To all whom it may concern:

Be it known that I, ALBERT HAYES, a citizen of the United States,residing at Salt Lake City, in the county of Salt Lake, State of Utah,have invented certain new and useful Improvements in Methods ofControlling the Vibration of Diaphragms, of which the following is adescription, reference being had to the accompanying drawings, forming apart hereof.

My invention'relates to methods of controlling the vibration ofdiaphragms of sound reproducing devices such as gramophones,graphophones and other devices in which sound is reproduced by thevibration of the diaphragm, and the invent-ion has for its object topermit the eifective use of larger diaphragms than those ordinarilyused, to control the vibration of the diaphragm, to provide channels forthe sound Waves, and to so control the vibration of the diaphragm as toproduce clear well defined tones, to eliminate blasting and whirringfrom the tones produced, to prevent blurring and mixing or confusion ofsuccessive tones,

to reproduce the tones of the human voice and of musical instruments ina natural way and with a minimum of mechanical suggestion, to giveprecision and clearness to the reproduction of the enunciation of words,and in general, to secure improved results in the reproduction ofsounds.

With these and other objects hereinafter set forth in view my inventionconsists in the method hereinafter described and particularly pointedout in the claims.

Referring to the drawings which illustrate a form of device capable ofuse to carry out my improved method: Figure 1 is a vertical sectionalview of a sound box embodying my invention taken in a plane in line withthe reproducer lever. Fig. 2 is a similar view taken on a plane atrightangles to that on which Fig. 1 is taken; and Fig. 3 is a top planview partly broken away of the sound box.

In the drawings 1 indicates the body or main member of the sound boxhaving central opening 2 for the outlet of the sound produced by thevibration of the disk or diaphragm 3.

4 indicates the cover member of the sound box which in the constructionshown fits into the main member 1 and is retained therein by screws 5. e

The inner faces of the members -1 and 4 are waved or corrugated asshown. the corrugations of the cover 6 extending from the peripheryinward to the central opening 7 which is about the diameter of thecentral opening 2. These corrugations are formed on curved linespreferably the arcs of circles drawn from centers located in a circleconcentric with the disk or diaphragm 3 and between its center and itsperiphery.

The disk or diaphragm 3 has its periphery inclosed in a gasket 8 ofyielding material such as semihard rubber and this gasket is heldbetween the members 1 and 4.- of the sound box, the corrugations 6serving to cause the gasket to be compressed at regular intervals alonglines which are on the arcs of circles not concentric with the disk ordiaphragm. The compression of the gasket necessarily transmits pressureto the disk or diaphragm 3 so that thedisk or diaphragm is held at itsperiphery between surfaces which are subjected to relatively highpressure at successive points while between such points the pressure isrelatively low, the result being that the vibration of the disk ordiaphragm is materiallymodified or controlled with'the effect ofeliminating objectionable overtones and giving clear, pure tones freefrom harshness.

The means for vibrating the disk or diaphragm may be of any'usual form.As

here shown it consists of a lever 10 connected with the center of thedisk or diaphragm and having trunnions 11 carried in bearings formed inears 12 onthe periphery of the body or main member of the sound box.This lever is provided at its free end with a socket 13 for the usualneedle or stylus.

While the apparatus as thus described produces very satisfactory resultsI prefer to use with it a damper or buffer, preferably in the. form of adisk 15 of paper or other nonrreverberant material. This damper orbuffer is arranged between the disk or diaphragm 3 and the face of thebody or main member 1 of the sound box resting on the corrugations 6.This damper disk is preferably cut away centrally, the cut out portioncorresponding in diameter with the diameter of the central opening 2 andis glued or otherwise secured to one of the plates.

It will be understood that I do not herein claim the apparatus describedand. shown as that forms the subject matter of a separate appllicationfiled by me of even date herewit Having thus described my invention whatI claim i v 1. The method of mountin a diaphragm comprising theprovision 0 a peripheral resilient gasket for the diaphragm andsubjecting the diaphragm and gasket to regularly recurring relativelyhigh and low pressures at right angles thereto.

2.-The me hod of controlling the vibra- .tion of a diaphragmcomprisingthe provision of a pheripheral resilient gasket for the diaphragm andsubjecting the dia phragm andasket to regularly recurring relativel bigand low pressures at right angles ereto and vibrating the center of thediaphragm.

This specification signed and witnessed this 10th day of July A. D.1913.

ALBERT HAYES. In the presence of- WM. F. DOYLE, PARKER COOK.

